402109999 has 2 divisors, whose sum is σ = 402110000. Its totient is φ = 402109998.

The previous prime is 402109979. The next prime is 402110029. The reversal of 402109999 is 999901204.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 402109999 - 2¹⁵ = 402077231 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (402109909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201054999 + 201055000.

It is an arithmetic number, because the mean of its divisors is an integer number (201055000).

Almost surely, 2^402109999 is an apocalyptic number.

402109999 is a deficient number, since it is larger than the sum of its proper divisors (1).

402109999 is an equidigital number, since it uses as much as digits as its factorization.

402109999 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 52488, while the sum is 43.

The square root of 402109999 is about 20052.6805938757. The cubic root of 402109999 is about 738.0995788351.

The spelling of 402109999 in words is "four hundred two million, one hundred nine thousand, nine hundred ninety-nine".